If I purchase a train ticket to Monterosso in Pisa airport which I plan to use on the direct train journey to Monterosso but if I miss that connection at Pisa Centrale can the same ticket be used on train from Pisa to La Spezia and then local train to Monterosso? Is it better to buy a return ticket and is there a discount for the over 60's! We arrive Pisa airport Friday, May 14 and return to Pisa Tuesday, April 18.